swap_horiz James Dunlop Alternatives

1

Friedrich Bessel

Friedrich Bessel was a 19th-century German astronomer renowned for his groundbreaking work in astrometry. He accurately...

German 19TH Century Historical Astrometry

8.8 Great

2

Ulugh Beg

Ulugh Beg was a 15th-century astronomer and scholar of the Timurid Empire. He established an observatory in Samarkand, u...

Medieval Observatory Samarkand Catalogs

8.6 Great

3

Abd al-Rahman al-Sufi

Abd al-Rahman al-Sufi was a 10th-century Persian astronomer whose 964 Book of Fixed Stars cataloged constellations and n...

History Catalog Medieval Islamic

8.6 Great

4

Bernard Lovell

Bernard Lovell was a twentieth-century British astronomer instrumental in developing radio astronomy. He established the...

Radio British Observatory Twentieth Century

8.2 Great

5

Max Wolf

Max Wolf was a German astronomer who pioneered astrophotography in asteroid discovery, finding 323 Brucia photographical...

Germany Photography 19TH Century Asteroids

8.2 Great

6

Angelo Secchi

Italian Jesuit priest and astronomer (1818–1878) who devised one of the first stellar spectral classification systems, g...

Italian 19TH Century Historical Stellar Classification

8.0 Great

7

Edward Barnard

American astronomer who in 1916 identified Barnard's Star, which holds the record for the highest proper motion of any k...

American 19TH Century Observational Comets

7.9 Good

8

Ali Qushji

Ali Qushji was a 15th-century Timurid-Ottoman astronomer and mathematician from Samarkand whose works helped shape Ottom...

Theory Medieval Observatory Ottoman

7.9 Good

9

George Ogden Abell

George Ogden Abell was an American astronomer who compiled the 1958 Abell catalogue of 2,712 rich galaxy clusters from P...

Catalog 20TH Century Galaxies Clusters

7.8 Good

10

Giovanni Schiaparelli

Italian astronomer who in 1877 mapped Mars and described linear features he called canali, a term mistranslated as canal...

Italian 19TH Century Planetary Mars

7.7 Good

11

Heinrich Wilhelm Matthias Olbers

Heinrich Wilhelm Matthias Olbers was a German physician-astronomer who discovered Pallas in 1802 and Vesta in 1807 and f...

Medicine 19TH Century Comets Asteroids

7.7 Good

12

John Couch Adams

British mathematician who in 1845 independently predicted the position of Neptune by calculating perturbations in Uranus...

19TH Century British Planetary Celestial Mechanics

7.6 Good

13

Taqi ad-Din Muhammad ibn Ma'ruf

Taqi ad-Din Muhammad ibn Ma'ruf was a 16th-century Ottoman astronomer who founded the Istanbul Observatory in 1577, cons...

Medieval Observatory Ottoman Instruments

7.6 Good

14

William Parsons (Lord Rosse)

Irish astronomer who in 1845 completed the 72-inch Leviathan of Parsonstown telescope, then the world's largest, and use...

Telescope 19TH Century Observational Irish

7.5 Good

15

Mu'ayyad al-Din al-Urdi

Mu'ayyad al-Din al-Urdi was a 13th-century Syrian astronomer at Maragha Observatory, known for the Urdi lemma used in pl...

Theory Medieval Persia Observatory

7.4 Good

16

Brian Marsden

Brian Marsden was a British astronomer who directed the Minor Planet Center from 1978 and became a leading authority on...

Catalog 20TH Century Comets Minor Planets

7.4 Good

17

Robert Burnham Jr.

Robert Burnham Jr. was an American Lowell Observatory astronomer and author of the three-volume Burnham's Celestial Hand...

American Catalog Historical Popularizer

7.4 Good

18

Asaph Hall

American astronomer who in 1877 discovered the two moons of Mars, Phobos and Deimos, using the 26-inch refractor at the...

American 19TH Century Observational Planetary

7.3 Good

19

Benjamin Gould

Benjamin Gould was an American astronomer who founded The Astronomical Journal in 1849 and helped found Argentina's Cord...

History American Catalog Nineteenth Century

7.3 Good

20

Simon Newcomb

Canadian-American astronomer (1835–1909) who produced precise mathematical tables of solar system body positions that se...

American 19TH Century Planetary Celestial Mechanics

7.2 Good